I used this method to tame mine so FEEL FREE TO USE IT!

1. Tame a tapejara (they have more than one seat)

2. Make the tapejara follow you so they don’t completely go down and land while on the passenger seat.

3. Go fly a bit higher so the bronto can’t catch you.

4. Hit the bronto until it’s knocked out! But be careful that it goes in water because it will drown.

5. I recommend carbonemys kibble because it goes faster. Or wait for it to starve then feed it berries to get it tamed faster.